Perodic Table Information

For each compound, and where possible, a formal oxidation number for each element is given, but the usefulness of this number is limited, especially so for p-block elements in particular. Based upon that oxidation number, an electronic configuration is also given but note that for more exotic compounds you should view this as a guide only.

Element	%	Formal oxidation state	Formal electronic configuration
H	2.49	1	1s⁰
Se	97.51	-2	[Ar].3d¹⁰.4s².4p⁶

Synthesis

Hydrogen selenide (danger!!) can be made in the laboratory by the direct reaction of the elements but might best be made from aluminium selenide. With considerable care, the reaction between aluminium selenide and water can be used in the laboratory to make hydrogen(II) selenide. Hydrogen(II) selenide is a colourless gas which boils at -42°C and freezes at -66°C.

Al₂Se₃ + (3 + x)H₂O 3H₂Se + Al₂O₃.xH₂O

Solid state structure

Geometry of hydrogen: 1 coordinate: terminus
Prototypical structure:

Crystal structure of hydrogen (I) selenide

Isotope pattern

What follows is the calculated isotope pattern for the H₂Se unit with the most intense ion set to 100%.

Formula: H₂Se₁

mass %76 1.8 _
77 0.0 
78 18.1 _________
79 1.5 _
80 47.5 ________________________
81 0.0 
82 100.0 __________________________________________________
83 0.0 
84 18.5 _________
85 0.0

Suppliers

Coming soon....

References

The data on these compounds pages are assembled and adapted from the primary literature and several other sources including the following.

R.T. Sanderson in Chemical Periodicity, Reinhold, New York, USA, 1960.
N.N. Greenwood and A. Earnshaw in Chemistry of the Elements, 2nd edition, Butterworth, UK, 1997.
F.A. Cotton, G. Wilkinson, C.A. Murillo, and M. Bochmann, in Advanced Inorganic Chemistry, John Wiley & Sons, 1999.
A.F. Trotman-Dickenson, (ed.) in Comprehensive Inorganic Chemistry, Pergamon, Oxford, UK, 1973.
R.W.G. Wyckoff, in Crystal Structures, volume 1, Interscience, John Wiley & Sons, 1963.
A.R.West in Basic solid state chemistry Chemistry, John Wiley & Sons, 1999.
A.F. Wells in Structural inorganic chemistry, 4th edition, Oxford, UK, 1975.
J.D.H. Donnay, (ed.) in Crystal data determinative tables, ACA monograph number 5, American Crystallographic Association, USA, 1963.
D.R. Lide, (ed.) in Chemical Rubber Company handbook of chemistry and physics, CRC Press, Boca Raton, Florida, USA, 77th edition, 1996.
J.W. Mellor in A comprehensive treatise on inorganic and theoretical chemistry, volumes 1-16, Longmans, London, UK, 1922-1937.
J.E. Macintyre (ed.) in Dictionary of inorganic compounds, volumes 1-3, Chapman & Hall, London, UK, 1992.